Summary
Built in 1942 by designer Edwin W. Burritt, this earth dam stands 25 feet tall and stretches 918 feet in length. With a storage capacity of 2449 acre-feet and a surface area of 173 acres, the dam serves primarily for irrigation purposes in the region.
Despite its age, J & J has been regulated, inspected, and enforced by the State of Wyoming, ensuring its safe operation and low hazard potential. However, recent condition assessments have deemed its structural integrity as poor, indicating a need for maintenance and potential upgrades. The dam's spillway, an uncontrolled type with a width of 152 feet, poses a moderate risk according to the latest risk assessment.
Located 30 miles from Casper, Wyoming, J & J presents an opportunity for water resource and climate enthusiasts to study the impact of aging infrastructure on water management practices. With its historical significance and operational challenges, this dam serves as a valuable case study for understanding the complexities of maintaining water resources in a changing climate.
Year Completed |
1942 |
Dam Length |
918 |
Dam Height |
25 |
River Or Stream |
POISON SPIDER CR |
Primary Dam Type |
Earth |
Surface Area |
173 |
Hydraulic Height |
21 |
Nid Storage |
2449 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
J & J